Can anyone point me in a direction to troubleshoot these codes on my '03 MCS? All four came up simultaneously, so I'm unsure if all the sensors failed: PO0445, PO0340, PO0037, PO0031. Is there a fuse with all of these in common or another common intersection that would trip all of them?

 

Strange - All those codes popped up at once?
​​​​​​PO0445 = Fuel purge EVAP gone bad/leak?
PO0340 = Camshaft position sensor?
PO0037 = Post CAT oxygen sensor gone bad?
PO0031 = Pre-CAT upstream Oxygen sensor gone bad?

Google AI seems to suggest a possible short in wiring - So you maybe on to something regarding wiring/fuse...

Did the SES light come on?
Is the engine acting abnormally?

 

Sorted it out. Turned out to be a blown fuse under the hood.

 

now the question becomes...why did the fuse blow?

 

^^^Even more curious^^^
Which fuse was it that blew???
Do tell. Inquiring minds want to know.